Complete conditional infinity import TODO

[SecretiveShell]

Why should this feature be added?

• additional logging
• changed declaration order prevents has_infinity_emb becoming undefined when there are errors other then import error
• added additional type hinting

Examples
The software is more likely to crash without these changes if there is an issue with the infinity embed backend

Additional context
completes a TODO in the code

[bdashore3]

I agree with a refactor of the error handling here, but I'd also like to remove the log statements for two reasons:

1. The logger isn't set up at the time of import
2. An import check isn't required unless a user wants to use embeddings, which the codebase already checks for. The import is at the top-level because of infinity's own logger which requires an issue on their end to make it configurable.

I can merge this after removing those logging statements and using a pass with the exception handler.

[SecretiveShell]

should be ready for merge now, I made all the changes asked.